2019 Ram ProMaster Battery Size, CCA & Group Reference

The 2019 Ram ProMaster is a heavy-working cargo van that requires a robust electrical system to handle daily start-stop cycles, delivery routes, and upfitter accessories. Because the battery is located inside the cabin—specifically under the driver’s side floorboard—getting the right battery type and size is critical for safety and performance.

Here is your ASE-certified guide to replacing the battery in your 2019 Ram ProMaster (1500, 2500, and 3500 models equipped with the 3.6L Pentastar V6).

Quick answer: 2019 Ram ProMaster Battery Specs

• BCI Group Size: Group H7 (also known as Group 94R).
• Cold Cranking Amps (CCA): 730 CCA minimum (800+ CCA highly recommended for cold climates and heavy electrical loads).
• Reserve Capacity (RC): 140 minutes minimum.
• AGM vs. Flooded: AGM (Absorbent Glass Mat) is strictly recommended due to the interior mounting location under the floorboard.
• Terminal Layout: Standard top post, Right Positive (when viewing from the front of the battery).
• Physical Dimensions: Approximately 12.4" Length x 6.8" Width x 7.5" Height.
• Dual-Battery Setup: Standard cargo/passenger vans feature a single-battery setup. However, many RV conversions or specific upfitter packages may feature a secondary auxiliary battery wired in parallel or via an isolator.

Replacement battery options

Because the ProMaster is often used for commercial duty, investing in a high-quality battery pays off in reduced downtime. Here are some of the most popular and reliable Group H7/94R replacements on the market:

• Interstate Batteries MTX (AGM): Part # MTX-94R/H7 (An excellent, long-lasting AGM option with 850 CCA).
• DieHard Platinum AGM: Part # 94R-AGM (A widely available, rugged battery offering strong vibration resistance and 850 CCA).
• Odyssey Performance Series: Part # ODP-AGM47 H7 L4 (Premium dry-cell AGM design offering massive deep-cycle reserves and exceptional lifespan).
• Optima YellowTop: Part # DH7 (A premium deep-cycle and starting battery perfect for vans with added inverters or cargo lighting).
• ACDelco Gold AGM: Part # 94RAGM (A solid OEM-quality replacement with an excellent warranty).

AGM vs flooded — which does this vehicle need?

For the 2019 Ram ProMaster, you should absolutely use an AGM (Absorbent Glass Mat) battery.

While a traditional flooded lead-acid battery of the same group size will physically fit and start the engine, the battery compartment is located inside the passenger cabin beneath the driver’s feet. Flooded batteries naturally vent corrosive and potentially harmful hydrogen gases during normal charging and discharging. AGM batteries are sealed and valve-regulated (VRLA), meaning they do not off-gas under normal conditions, making them infinitely safer for enclosed interior spaces. Furthermore, AGM batteries handle the heavy electrical demands of commercial vans much better than their flooded counterparts.

(Note: If you do install a replacement battery, ensure the factory vent tube is properly connected to the vent port on the new battery to route any emergency gases safely outside the cabin).

Post-installation relearn / reset procedure

Unlike some modern European vans, the 2019 Ram ProMaster does not require a complex computerized "battery registration" process using a bi-directional scan tool. However, disconnecting the battery will reset the Powertrain Control Module (PCM) and body modules. Follow this basic relearn procedure after installation:

1. Start the vehicle: Turn the key and start the van. Let it idle in Park for about 10 minutes to allow the PCM to relearn baseline idle air trims.
2. HVAC Calibration: Turn your climate controls to full cold, then full hot, and cycle through the vent positions.
3. Radio/Clock: You will need to reset your radio presets and the clock on the Uconnect system.
4. Steering Angle Sensor: Turn the steering wheel lock-to-lock (all the way left, then all the way right) to initialize the steering angle and electronic stability control (ESC) sensors.

Signs of a failing battery

Because commercial vans are driven hard, keep an eye out for these warning signs that your ProMaster's battery is on its way out:

• Slow or labored engine cranking, especially on cold mornings.
• The "Battery Saver Mode" message appearing on the dashboard.
• Flickering interior cargo lights or dimming headlights when the cooling fans kick on.
• Random electrical gremlins (e.g., radio shutting off, power windows moving slowly, or ABS/ESC warning lights flashing momentarily during startup).

Common battery issues for this generation

The biggest issue with the 2019 Ram ProMaster's battery setup is its location. Housed beneath a panel under the driver’s side floor mat, it is susceptible to accumulating dirt, moisture, and debris tracked in by the driver's boots. If the cover isn't sealed properly, the battery terminals can develop severe corrosion hidden out of sight.

Additionally, delivery drivers who make dozens of short trips a day (starting and stopping the engine frequently) may experience premature battery failure, as the alternator never gets enough run-time to fully recharge the battery. If this sounds like your route, trickle charging the van overnight or installing a premium deep-cycle AGM like the Optima YellowTop is highly recommended.

Find a trusted shop on Repairius.